JP4173234B2 - Cross roller bearing and retainer for cross roller bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cross roller bearing and a retainer used therefor.
[0002]
[Prior art]
The cross roller bearing is known as having a simple structure and capable of simultaneously receiving loads in all directions such as an axial load, a radial load, and a moment load with a single belling. Usually, in cross roller belling, means for aligning the rollers is provided.
Conventionally, there is a cross roller bearing provided with a metal retainer as means for aligning the rollers. This retainer is formed by forming a thin metal plate into a short cylindrical shape, and windows are provided at equal intervals in the circumferential direction, and a roller is accommodated in each window.
Another known cross roller bearing has a resin spacer (spacer retainer) interposed between the rollers.
[0003]
[Problems to be solved by the invention]
Since the metal retainer described above has a small contact area with the roller, the holding of the roller is not always stable, and skew is likely to occur, which may lead to a decrease in load capacity and an increase in wear amount. In addition, noise may be generated due to metal contact between the retainer and the roller. There is a concern that these problems become prominent during high-speed rotation.
On the other hand, since the spacer has a large contact area with the roller and is made of resin, the use of the spacer reduces the above-described problems. However, the clearance between the roller and the spacer (circumferential clearance) always changes during rotation, and there is a possibility that the roller at the location where the clearance becomes large causes a skew. In addition, the thickness of the spacer is set to be relatively large in order to prevent the spacer itself from falling down, and accordingly, the number of rollers is limited and it is difficult to increase the load capacity.
The present invention has been made in view of the drawbacks of the prior art described above, and has various effects such that all rollers stably roll without causing skew and no noise is generated. It is an object of the present invention to provide an obtained cross roller bearing and a retainer capable of exhibiting the effect.
[0004]
[Means for Solving the Problems]
  According to a first aspect of the present invention, an inner ring having a V-shaped cross section formed on the outer periphery and an outer ring having a V-shaped cross section formed on the inner periphery are arranged coaxially to form the groove. A raceway is formed between the plurality of rollers, and in the cross roller bearing in which a plurality of rollers are arranged and accommodated in different directions, a resin retainer having a ring shape is accommodated in the raceway.Is, Spacers interposed between adjacent rollers, and connecting parts connecting these spacersAndIntegrated moldingIs made up of,The spacer portion has two conical surfaces facing the groove of the inner ring, two conical surfaces facing the groove of the outer ring, and a cylindrical surface for holding the roller on both sides in the circumferential direction. It is characterized by having.
[0005]
According to a second aspect of the present invention, in the cross roller bearing according to the first aspect, the connecting portion extends in the central axis direction of the retainer and is formed between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. It is characterized by being accommodated in a gap.
According to a third aspect of the present invention, in the cross roller bearing according to the first aspect, the connecting portion is accommodated in an accommodating groove formed in a bottom portion of a groove having a V-shaped cross section of the inner ring and the outer ring. .
According to a fourth aspect of the invention, in the cross roller ring according to the second or third aspect of the invention, the connecting portion is disposed on one side of each of the spacer portions.
According to a fifth aspect of the invention, in the cross roller ring according to the second or third aspect of the invention, the connecting portion is disposed on both sides of each of the spacer portions.
[0006]
  6thThe invention of the first to the5In the cross roller bearing according to any one of the above, the retainerOf the above conical surfaceIsExtending in the circumferential directionLubricant poolGrooves are formedIt is characterized by being.
  7thThe invention of the first to the6'sIn the cross roller bearing according to any one of the inventions, at least one of the inner ring and the outer ring is configured by coupling a pair of ring members, and the retainer is cut in a direction intersecting the circumferential direction at one location, Thus, the diameter can be increased or decreased.
  8thThe present invention is a retainer that is used in a cross roller bearing in which a plurality of rollers are arranged with different directions of rotation shafts as appropriate, and holds the rollers in a state of being spaced apart at an equal interval. Integral molding of spacers arranged at intervals in the direction and connecting parts connecting these spacersThe spacer has two conical surfaces facing the groove of the inner ring of the cross roller bearing, and two conical surfaces facing the groove of the outer ring of the cross roller bearing, and Cylindrical surfaces for holding the roller on both sides in the circumferential directionIt is characterized by that.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a cross roller bearing constituting a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the cross roller bearing has an inner ring 10, an outer ring 20, a large number of rollers 30 accommodated between the inner and outer rings 10, 20, and a state in which these rollers 30 are spaced apart from each other. A retainer 40 for holding is provided as a basic component.
As shown in FIGS. 1, 3, and 6, the outer peripheral surface of the inner ring 10 forms a cylindrical surface 15, and a groove 16 having a V-shaped cross section is formed at the center in the axial direction. This groove | channel 16 consists of a pair of conical surface 16a which mutually opposes. These conical surfaces 16 a are inclined at 45 ° with respect to the central axis L of the inner ring 10.
[0008]
As shown in FIGS. 1, 3, and 6, the outer ring 20 is configured by connecting a pair of ring members 21. Specifically, both ring members 21 have the same shape, and each inner peripheral surface is formed by connecting a cylindrical surface 25 and a conical surface 26a inclined at 45 ° with respect to the central axis L. Is formed. In a state where the pair of ring members 21 are coupled to each other, a groove 26 having a V-shaped cross section is formed by the two conical surfaces 26a.
The mutual contact surfaces of the pair of ring members 21 are flat surfaces, and a plurality of grooves 24a extending in the radial direction are formed on the flat surfaces at an angle of, for example, 90 ° in the circumferential direction. These grooves 24 a are combined to form a lubricant injection hole 24 communicating with the groove 26.
[0009]
The inner ring 10 and the outer ring 20 are coaxially arranged on the same plane, and the grooves 16 and 26 face each other, thereby forming an annular track 50 having a substantially square cross section. A gap 55 is formed between the cylindrical surface 15 of the inner ring 10 and the cylindrical surface 25 of the outer ring 20. The inner ring 10 and the outer ring 20 are made of bearing steel (for example, SUJ2) or SUS440C.
[0010]
Each of the rollers 30 has a cylindrical shape, and the diameter and the axial length are substantially equal (more precisely, the diameter is slightly larger). The rollers 30 are accommodated side by side in the track 50, and the rotation centers thereof are the inner and outer rings 10, 20. It is inclined by 45 ° with respect to the central axis L. In the case of this embodiment, the rollers 30 are alternately arranged one by one with different inclination directions. When viewed along the track 50, the rotation axes of the adjacent rollers 30 intersect at an angle of 90 °. (See FIG. 1, FIG. 4 [C], [D] and FIG. 5). As the material of the roller 30, bearing steel (for example, SUJ2) or SUS440C is adopted.
[0011]
The retainer 40 has an annular shape, is accommodated in a track 50 between the inner ring 10 and the outer ring 20, and is coaxial with the inner and outer rings 10 and 20. As shown in FIGS. 4 to 7, the retainer 40 has first spacer portions 41 and second spacer portions 42 that are arranged alternately at equal intervals in the circumferential direction so as to be interposed between adjacent rollers. And a pair of connecting portions 43 connected to the spacer portions 41 and 42. These components 41, 42 and 43 are integrally molded using a synthetic resin as a material. The material and production of the retainer 40 will be described in detail later.
[0012]
The pair of connecting portions 43 have the same diameter, form an annular band (short cylindrical shape), and face each other in the direction of the central axis L. As shown in FIG. 6, the pair of connecting portions 43 are inserted through a gap 55 between the cylindrical surface 15 (outer peripheral surface) of the inner ring 10 and the cylindrical surface 25 (inner peripheral surface) of the outer ring 20.
[0013]
The spacer portions 41 and 42 are disposed between the pair of connecting portions 43. As shown in FIG. 6, these spacers 41, 42 have a square shape in which the cross-sectional shape along the radial direction of the inner and outer rings 10, 20 is smaller than the cross section of the track 50, and are loosely inserted into the track 50. Has been. In this state, the radially inner portion of the spacers 41 and 42 protrudes so as to enter the groove 16 having a V-shaped cross section of the inner ring 10, and two cones of this portion (portion forming a right triangle). The face faces the conical face 16a of the groove 16 respectively. Similarly, the radially outer portion of the spacer portions 41 and 42 protrudes so as to enter the groove 26 having a V-shaped cross section of the outer ring 20, and the two conical surfaces of this portion are the cones of the groove 26. It faces the surface 26a.
[0014]
On both sides of the first spacer 41 (both sides in the circumferential direction of the retainer 40), cylindrical surfaces 41a and 41b that are inclined by 45 ° with respect to the central axis L of the retainer 40 and that have different inclination directions are formed. . Similarly, cylindrical surfaces 42 a and 42 b are formed on both sides of the second spacer 42. The connecting portion 43 is formed with a notch 43a, and the notch 43a is formed with a cylindrical surface continuous with the cylindrical surfaces 41a, 41b, 42a, and 42b.
[0015]
One cylindrical surface 41a of the first spacer 41 (a cylindrical surface positioned counterclockwise when viewed from the circumferential center of the first spacer 41) and one cylindrical surface 42a of the second spacer 42 ( A housing space 45a for housing the roller 30 is formed between the second spacer portion 42 and a cylindrical surface positioned in the clockwise direction when viewed from the center in the circumferential direction.
Similarly, an accommodation space 45b for accommodating the roller 30 is formed between the other cylindrical surface 41b of the first spacer portion 41 and the other cylindrical surface 42b of the second spacer portion 42. .
[0016]
  As shown in FIGS. 4C and 4D, the central axes Ka and Kb of the receiving spaces 45a and 45b are inclined by 45 ° with respect to the central axis L of the retainer 40, but the inclination directions are different and orthogonal to each other. ing. Therefore, the rollers 30 accommodated in the accommodating spaces 45a and 45b are arranged by alternately changing the inclination directions of the rotation centers.
  In addition, the arrangement of the rollers 30 is arranged so that the rotation centers are alternately arranged one by one as in this embodiment.OrthogonalInstead of this, the direction of the rotation center may be changed every two, three, etc., and various arrangements are possible.
  As shown in FIG. 6, the peripheral surface of the roller 30 accommodated in one accommodation space 45 a is formed by one conical surface 16 a (the upper conical surface in FIG. 6) of the groove 16 of the inner ring 10 and the groove 26 of the outer ring 20. It contacts one conical surface 26a (the lower conical surface in FIG. 6). Similarly, the circumferential surface of the roller 30 accommodated in the other accommodation space 45 b is formed on the other (lower) conical surface 16 a of the groove 16 of the inner ring 10 and the other (upper) conical surface 26 a of the groove 26 of the outer ring 20. It touches.
[0017]
As shown in FIGS. 4A and 4B, the retainer 40 is cut in one direction at a location that intersects the circumferential direction, and in the case of the present embodiment, is orthogonal (diameter direction). Specifically, the pair of connecting portions 43 corresponding to the accommodation holes 45b are cut. This cutting line is indicated by reference numeral 48 in the figure. Since the retainer 40 is made of resin and has elasticity, as shown by an arrow in FIG. 4A, the retainer 40 is expanded in diameter (two ends facing each other at the cutting line 48 are separated from each other), or On the contrary, it can be freely elastically deformed so as to reduce the diameter. Since each said spacer part 41 and 42 and a pair of connection part 43 are located on a virtual cylindrical surface, this elastic deformation is comparatively easy.
[0018]
By cutting the retainer 40 at one place as described above, the cross roller bearing can be assembled using inner and outer rings that are not divided in half in the radial direction. That is, for example, as in the present embodiment, if the outer ring 20 is configured by joining a pair of ring members 21, the assembly of the bearing is possible, and a break may occur in the middle of the V-shaped groove. And a smooth rolling of the roller is guaranteed. The assembly of the cross roller bearing will be described later. In this embodiment, the outer ring 20 is constituted by a pair of ring members, but at least one of the inner and outer rings 10 and 20 may be divided in this way.
[0019]
By the way, as shown in FIGS. 6 and 7, in the spacers 41 and 42 of the retainer 40, the conical surface of the portion that enters the groove 26 of the outer ring 20 serves as a lubricant reservoir that extends in the circumferential direction of the retainer 40. A lubricant reservoir groove 49 is formed. By providing the lubricant reservoir groove 49, the lubricant once supplied and filled, for example, grease or normal lubricant is retained for a long period of time, and the lubrication state is maintained for a long period of time without lubrication, so-called maintenance-free. Contribute to.
As will be described later, in the case where the retainer 40 itself is held by dipping the lubricant, the lubricant is retained for a very long time even if no lubricant is supplied in combination with the lubricant retaining function by the lubricant reservoir groove 49. Operation is made and maintenance-free is realized. The lubricant reservoir for holding the lubricant is not limited to the lubricant reservoir groove 49 as described above, and various configurations can be adopted.
[0020]
  Here, the material and manufacturing method of the retainer 40 will be described. First, the material of the retainer 40 is a synthetic resin such as a polyamide-based elastomer or a polyester-based elastomer.
  Using such a material, it is manufactured by injection molding. Specifically, a dummy roller having a diameter slightly larger than that of the roller 30 is appropriately arranged in the molding die, and the molten synthetic resin is injected into the die, cooled and solidified, and then released. Dummy from the molded body thus obtainedrollerThe retainer 40 is completed. In this way, if the retainer 40 is formed using a dummy roller having a diameter larger than that of the actual roller 30 as a core, the cylindrical surfaces 41a, 41b, 42a, 42b of the spacer portions 41, 42 described above are dummy rollers. Therefore, it can be easily formed as a curved surface having a radius of curvature larger than the radius of the roller 30. Instead of the dummy roller, a projection having the same dimensions as the dummy roller may be formed on the molding surface of the molding die, and the projection may be removed from the molded body as the mold is released.
[0021]
On the other hand, without using a dummy roller, it is possible to insert the roller 30 itself as a core from the beginning into a molding die, thereby forming the retainer 40. However, in this case, since the roller 30 and the molded body are in close contact with each other, the molded body taken out from the mold is immersed in mineral oil-based lubricating oil as it is, and the molded body made of synthetic resin is swollen with the lubricating oil. Thereby, the cylindrical surface of each spacer part 41 and 42 becomes a curved surface with a larger curvature radius than the radius of the roller 30.
[0022]
In the retainer 40 formed as described above, a gap is formed between the roller 30 and the spacer portions 41 and 42, and free rotation of the roller 40 with respect to the spacer portion can be ensured.
[0023]
By immersing the molded body in the lubricating oil as described above, the retainer 40 itself is impregnated (held) with the lubricating oil, the durability is improved, and the lubrication state is maintained for a long time without refueling, so-called maintenance. Free is achieved.
Note that the amount of retainer 40 impregnated with the lubricating oil can be adjusted by appropriately selecting the material of the retainer itself and the type of the lubricating oil impregnated therein.
In this embodiment, the lubricating oil is impregnated after being molded into a predetermined shape with a synthetic resin. In addition to this, the lubricating oil is mixed (held) in advance with a synthetic resin as a material, and then the predetermined shape is obtained. A molded product obtained by mixing a lubricating oil in the monomer at the stage of producing a synthetic resin by polymerizing the monomer, and molding the obtained synthetic resin containing a lubricating oil into a predetermined shape can also be used.
[0024]
In the above configuration, the roller 30 rolls in the track 50 during the relative rotation of the inner and outer rings 10 and 20. At this time, the retainer 40 also rotates along the track 50 as the roller 30 rolls. Since the spacers 41 and 42 included in the retainer 40 have a large contact area with the roller 30, the holding of the roller 30 is stable and hardly causes a skew. In addition, since the spacer portions 41 and 42 are connected to each other by the connecting portion 43, the clearance (circumferential clearance) between the cylindrical surfaces 41a, 41b, 42a and 42b of the spacer portions 41 and 42 and the roller 30 is provided. There is almost no change, and some rollers do not skew due to the clearance. From these things, all the rollers 30 roll stably, load capacity is ensured, and the amount of wear is suppressed small. Further, since the retainer 40 is made of resin, the sound generated by contact with the roller 30 is also at a very low level. During high-speed rotation, centrifugal force acts on the spacer portions 41 and 42, and the contact stress acting between the spacer portions and the rollers is relieved.
[0025]
Moreover, since the said spacer parts 41 and 42 are supported by the connection part 43 and do not fall down, in order to prevent a fall, it is not necessary to set the thickness of the spacer parts 41 and 42 large. Therefore, the thickness of the spacer, that is, the dimension between the rollers can be minimized, and the load capacity can be increased by increasing the number of rollers 30.
In addition, each spacer part 41 and 42 may form a cylindrical surface only in one side, respectively.
[0026]
The assembly work of the cross roller bearing will be described.
As described above, the annular retainer 40 is expanded in diameter so that the two ends facing each other at the cutting line 48 are widened, so as to correspond to the groove 16 of the inner ring 10, and in this state, the original natural annular shape is obtained. To restore. As a result, the portions protruding in the radial direction and inward direction of the spacer portions 41 and 42 of the retainer 40 are fitted into the groove 16.
The retainer 40 cannot be attached to the inner ring 10 if the retainer 40 is in an annular shape because the portions projecting in the radial and inward directions of the spacers 41 and 42 are obstructive. In the present embodiment, the retainer 40 is cut at one place so that the diameter can be once increased, so that the retainer 40 can be attached to the inner ring 10.
[0027]
Next, the one ring member 21 of the outer ring 20 is placed on a horizontal installation surface with the conical surface 26a facing upward.
And the inner ring | wheel 10 with which the retainer 40 was mounted | worn is fitted on the outer ring | wheel 20, and it mounts on the said installation surface. In this state, the roller 30 is fitted into all of the one accommodation hole 45a of the retainer 40.
Next, the other ring member 21 of the outer ring 20 is placed on the one ring member 21 with the conical surface 26a facing downward. As a result, an assembly composed of the inner and outer rings 10 and 20 and the retainer 40 in which half the number of rollers 30 to be planned is incorporated is formed.
Next, the assembly is turned upside down, and the one ring member 21 on the upper side is removed. In this state, the roller 30 is fitted into the other accommodation hole 45b of the retainer 40. As a result, all the rollers 30 are set in the retainer 40.
Next, the one ring member 21 is placed on the other ring member 21 again, and the pair of ring members 21 are fastened by using bolts 22 and nuts 23. Thus, the assembly of the cross roller bearing is completed.
[0028]
In the present embodiment, the outer ring 20 is constituted by a pair of ring members 21 and therefore the above assembly process is performed. However, when the inner ring 10 is constituted by a pair of ring members, the retainer 40 is connected to the cutting line 48. The two ends facing each other are reduced in diameter so as to overlap each other and are positioned in the groove 26 of the outer ring 20. In this state, the original annular shape is restored and attached to the outer ring 20.
[0029]
By the way, in this embodiment, the connecting portion 43 of the retainer 40 extends in the central axis direction of the retainer, and the cylindrical surface 15 (outer peripheral surface) of the inner ring 10 and the cylindrical surface 25 (inner peripheral surface) of the outer ring 20. Is accommodated in a gap 55 therebetween. According to such a configuration, the occupied space of the retainer 40 is formed without subjecting the inner ring 10 or the outer ring 20 to special processing such as a groove. Therefore, the rigidity of the inner and outer rings 10, 20 can be ensured and the cost can be reduced on the processed surface.
[0030]
  Subsequently, a cross roller bearing according to a second embodiment of the present invention will be described with reference to FIGS. In this 2nd Embodiment, the same number is attached | subjected to the structure part corresponding to 1st Embodiment, and the detailed description is abbreviate | omitted. A significant difference from the first embodiment is a resin retainer 40A.ofThe pair of annular connecting portions 43 'and 43 "are formed of flat ridges having different diameters. These connecting portions 43' and 43" are coaxially arranged on the same plane. The spacers 41 and 42 are disposed between them. The inner ring 10 and the outer ring 20 are formed with receiving grooves 17 and 27 for receiving the connecting portions 43 'and 43 "at the bottoms of the grooves 16 and 26 having a V-shaped cross section, respectively. For example, it is not necessary to house the connecting portion of the retainer 40 between the inner ring 10 and the outer ring 20, so that the gap between the inner and outer rings can be narrowed to the limit, so that leakage of lubricant from the roller circulation path can be suppressed, and Intrusion of dust or the like into the roller circulation path can be prevented.
[0031]
The present invention is not limited to the above-described embodiments, and various aspects are possible.
For example, in both the above embodiments, the connecting portion of the retainer 40 is provided on both sides of the ring seat portion, but it may be configured to be disposed only on one side of each spacer portion (not shown). According to the configuration in which the connecting portion is provided only on one side of the spacer portion, the contact area of the retainer with respect to the inner ring 10 or the outer ring 20 is reduced, and the rotational resistance is reduced. Further, the amount of the retainer material can be reduced, and the cost can be reduced.
However, according to the configuration in which the connecting portions are provided on both sides of the spacer portion as in the above-described embodiments, the connecting strength of the spacer portion by the connecting portion is large, the rigidity of the entire retainer is increased, and the roller skew is increased. Can be effectively regulated.
[0032]
【The invention's effect】
  As described above, according to the first invention, the spacer provided in the retainer has a large contact area with the roller, so that the roller is stably held and hardly skewed. In addition, since the spacers are connected to each other by the connecting part, the clearance between the spacer and the roller (circumferential clearance) hardly changes, and some rollers cause skew due to the clearance. There is nothing. From these things, all the rollers roll stably, a load capacity is ensured, and the amount of wear is restrained small.
  In addition, since the retainer is made of resin, the sound generated by contact with the roller is extremely low.
  Moreover, since the said spacer part is supported by the connection part and does not fall down, in order to prevent a fall, it is not necessary to set the thickness of a spacer part large. Therefore, the thickness of the spacer, that is, the dimension between the rollers can be minimized, and the load capacity can be increased by increasing the number of rollers.
  According to the second invention, the occupied space of the retainer is formed without applying special processing such as grooves to the inner ring or the outer ring. Therefore, it is possible to secure the rigidity of the inner and outer rings and reduce the cost on the processed surface.
  According to the third invention, it is not necessary to house the connecting portion of the retainer between the inner ring and the outer ring, so that the gap between the inner and outer rings can be narrowed to the limit. Therefore, leakage of the lubricant from the roller circulation path can be suppressed, and entry of dust or the like into the roller circulation path can be prevented.
  According to the fourth invention, the contact area of the retainer with respect to the inner ring or the outer ring is reduced, and the rotational resistance is reduced. Further, the amount of the retainer material can be reduced, and the cost can be reduced.
  According to the fifth aspect of the present invention, the coupling strength of the spacer portion by the coupling portion is large, the rigidity of the entire retainer is increased, and the skew of the roller can be effectively regulated.
  6thAccording to the invention ofBy providing the lubricant reservoir groove, the lubricant once supplied and filled is retained for a long period of time, the lubrication state is maintained for a long period of time, durability is improved, and so-called maintenance-free is achieved.
  7thAccording to this invention, a bearing can be assembled using the inner and outer rings which are not divided in half in the radial direction. That is, if at least one of the inner and outer rings is constituted by connecting a pair of ring members, it is possible to assemble the bearing, and there is no cut in the middle of the V-shaped groove. Rolling is guaranteed.
  8thAccording to this invention, it contributes to the effect which the cross roller bearing which concerns on the said 1st invention show | plays.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a cross roller bearing according to a first embodiment of the present invention.
FIG. 2 is a plan view of the cross roller bearing shown in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
4A is a plan view of a retainer of the cross roller bearing, FIG. 4B is a cross-sectional view taken along line BB in FIG. 4A, and FIG. 4C is CC in FIG. Sectional drawing in alignment with a line, (D) is sectional drawing in alignment with the DD line | wire in FIG. 4 (A).
FIG. 5 is an enlarged exploded perspective view showing a part of the retainer and a roller held by the retainer.
FIG. 6 is an enlarged cross-sectional view of a main part showing a state in which the roller and the retainer are stored in the cross roller bearing.
FIG. 7 is an enlarged sectional view of the retainer.
FIG. 8 is a cross-sectional view of a cross roller bearing according to a second embodiment of the present invention.
FIG. 9 is an enlarged cross-sectional view of a main part of the cross roller bearing.
10A is a plan view of the retainer of the cross roller bearing, FIG. 10B is a cross-sectional view taken along line BB in FIG. 10A, and FIG. 10C is CC in FIG. Sectional drawing in alignment with a line, (D) is sectional drawing in alignment with the DD line | wire in FIG. 10 (A).
FIG. 11 is an enlarged exploded perspective view showing a part of the retainer and a roller held by the retainer.
[Explanation of symbols]
10 Inner ring
16 Groove with V-shaped cross section (inner ring)
17 receiving groove
20 Outer ring
26 Groove with V-shaped cross section (outer ring)
27 receiving groove
30 Laura
40, 40A retainer
41, 42 Spacer (for retainer)
43, 43 ', 43 "(retainer) connection
50 orbit
55 Clearance

Claims (8)

An inner ring having a V-shaped groove on the outer periphery and an outer ring having a V-shaped groove on the inner periphery are arranged coaxially to form a track between the grooves. In the cross roller bearing in which a plurality of rollers are arranged and accommodated in this orbit with the rotation shafts having different directions as appropriate,
Plastic retainer an annular above the track is accommodated, the retainer includes a spacer portion interposed between adjacent rollers, is configured by integrally forming a connecting portion contiguous with these spacer portion,
The spacer portion has two conical surfaces facing the groove of the inner ring, two conical surfaces facing the groove of the outer ring, and a cylindrical surface for holding the roller on both sides in the circumferential direction. A cross roller bearing comprising:  The said connection part is extended in the central-axis direction of the said retainer, and is accommodated in the clearance gap formed between the outer peripheral surface of the said inner ring | wheel, and the inner peripheral surface of the said outer ring | wheel. Cross roller bearing.  2. The cross roller bearing according to claim 1, wherein the connecting portion is housed in a housing groove formed in a bottom portion of a groove having a V-shaped cross section of the inner ring and the outer ring.  4. The cross roller bearing according to claim 2, wherein the connecting portion is disposed on one side of each spacer portion.  4. The cross roller bearing according to claim 2, wherein the connecting portion is disposed on both sides of each spacer portion. The cross roller bearing according to any one of claims 1 to 5, wherein a lubricant reservoir groove extending in a circumferential direction is formed on the conical surface of the retainer. At least one of the inner ring and the outer ring is configured by connecting a pair of ring members, and the retainer is cut in a direction intersecting the circumferential direction at one place, and the diameter can be increased or decreased by its elasticity. The cross roller bearing according to any one of claims 1 to 6 . In a retainer that is used in a cross roller bearing in which a plurality of rollers are arranged with different directions of rotation shafts as appropriate, and holds the rollers in an equally spaced state,
It is formed by integrally molding spacer portions formed in an annular shape with resin and arranged at intervals in the circumferential direction, and a connecting portion connecting these spacer portions ,
The spacer has two conical surfaces facing the groove of the inner ring of the cross roller bearing, two conical surfaces facing the groove of the outer ring of the cross roller bearing, and the rollers on both sides in the circumferential direction. A retainer for a cross roller bearing, characterized by having a cylindrical surface for holding the roller.

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